honestly, think considering that you had a whole year off and managed to come back in year 11 with top grades, i completely think that you are capable of so much!! genuinely, and please take my word with this, there is no such things as aiming too high, please please dont limit yourself to your abilities because youre doing so great!! and also triple As are enough to get into almost any university, if not all of them, so i wouldnt stress, especially if you are consitently getting high grades. also typically, unis care more about your a-level grades than your gcses but im sure that they will consider and let things slide considering you did have a whole year off!